Season 1, episode 2 - The Moon or Bust, first aired Sep. 4, 1954
Mickey Mulligan (Mickey Rooney) and his friend build a rocket in an attempt to be the first men on the moon. They launch successfully, but instead of landing on the moon, they land in a cow field in rural Glendale, California (Glendale still had farms and cow meadows back in 1954). They try to communicate with a cow, assuming its the moon's most intelligent life form, until a farmer and his wife approach, thinking the space-suit-wearing kids are Martians.
This was a fun episode, and I admire Mickey Rooney's acting abilities. You can tell he's giving it everything he has, even though he wasn't a headlining feature film star by this point in his career. An enjoyable 25 minutes.